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>Cygwin/X Frequently Asked Questions: 2016-08-30 16:53&#13;</TH
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>Glossary</H1
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>firewall</B
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>Firewall software attempts to protect an internal network from
intrusions originating from an external network.</P
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>Virtual Private Network</B
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> (VPN)<DD
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>Virtual Private Networks are encrypted tunnels through which
private data can be safely transmitted over a private network
(e.g. the Internet).</P
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>X</A
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><B
>X Display Manager</B
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> (XDM)<DD
><P
>An X Display Manager presents a graphical login screen to X
users.  Often an XDM will allow the user to select a desktop
environment or window manager to be for their login session.  Some X
Display Managers are xdm, gdm (Gnome Display Manager), and kdm (KDE
Display Manager).</P
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>X Display Manager Control Protocol</B
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> (XDMCP)<DD
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>XDMCP allows XDM to process logins for users remote to the
machine that XDM is running on; login sessions will be run on the
machine running XDM.  For example, at a university you may use XDMCP
to login to an X session running on an engineering department computer
from your dorm room.</P
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><EM
>See Also: </EM
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>X Display Manager</A
>.</P
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>X11 Forwarding</B
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>&#13;Some SSH programs like OpenSSH provide a feature where in addition to the 
normal text channel opened between the local and the remote host another
encrypted channel is opened for the communication between the X11 client 
and the X11 server.  The SSH server will act as proxy-server for the
X11 clients and will forward all communication to the X11 server.
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